Can I check the day I was born?

Yes — pick your birth date and the tool tells you which weekday it was. It works for any past or future date your browser can represent.

What is the ISO weekday number?

ISO 8601 numbers the weekdays Monday=1 through Sunday=7. The tool shows this alongside the named day so you can use it in code or spreadsheets.

What day of the week is a future date?

Pick any upcoming date — a wedding, deadline or holiday — and the finder names the weekday instantly. It works the same for future dates as for past ones, so you can plan around weekdays and weekends.

Why does the weekday name appear in my own language?

The tool formats the day name using your browser's locale settings, so a French browser may show 'lundi' and an English one 'Monday'. The underlying ISO weekday number stays the same regardless of language.

How does it know if a date is a weekend?

It checks the day index: Saturday and Sunday are flagged as the weekend, and Monday to Friday as weekdays. This follows the common Western working-week convention rather than region-specific weekends.

Does it account for time zones?

The date you pick is treated as a calendar date with no time component, so the weekday is the same everywhere — there is no time-zone shift that could nudge it to the day before or after.

Is my date uploaded anywhere?

No — the weekday is computed entirely in your browser and nothing is ever uploaded.

Day of the Week Finder

Day of the week finder

Find out which day of the week any date falls on — past or future. It answers questions like “what day was I born?”, “what weekday is my deadline?” or “is that date a weekend?” in one click.

How it works

You pick a date and the tool reads its weekday from the calendar. Internally, dates are numbered 0 for Sunday through 6 for Saturday. From that it produces three pieces of information:

The named weekday (Monday, Tuesday, …), formatted in your browser’s language
The ISO 8601 weekday number, where Monday = 1 and Sunday = 7 — handy for spreadsheets and code
A weekend flag: a date is a weekend if it falls on Saturday or Sunday, otherwise it is a weekday

The date is handled as a pure calendar date with no time, so the result is the same in every time zone.

Example

For 15 June 2026:

Weekday: Monday
ISO weekday number: 1
Weekend: no (it is a weekday)

Date	Weekday	ISO number	Weekend?
2026-06-15	Monday	1	No
2026-06-20	Saturday	6	Yes
2000-01-01	Saturday	6	Yes

Everything runs entirely in your browser — nothing is uploaded.